A water-gated organic thin film transistor as a sensor for water-borne amines

TALANTA

卷:153

Article

Algarni, Saud A.¹  Althagafi, Talal M.¹  Al Naim, Abdullah²  Grell, Martin¹ 

[1] Univ Sheffield, Phys & Astron, Hicks Bldg,Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England

[2] King Faisal Univ, Dept Phys, Al Hasa, Saudi Arabia

关键词: Thin film transistor;    PBTTT;    Octylamine;    Biosensor;   

DOI  :  10.1016/j.talanta.2016.01.068

来源: Elsevier

【 摘 要 】

The p-type semiconducting polymer Poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) displays innate sensitivity to water-borne amines. We demonstrate this with the help of water gated PBTTT thin film transistors (TFTs). When octylamine is added to the gating water, TFTs respond with a significantly reduced saturated drain current. Underlying TFT drift is minimised by initial conditioning, and remaining drift can be accounted for by normalising current response to the current level under purge immediately before exposure. Normalised current response vs. amine concentration is reproducible between different transistors, and can be modelled by a Langmuir surface adsorption isotherm, which suggests physisorption of analyte at the PBTTT surface, rather than bulk penetration. Same PBTTT transistors do not respond to 1- octanol, confirming the specific affinity between amines and thiophene- based organic semiconductors. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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